<template>
  <div class="component-upload-image">
    <el-upload
        multiple
        :action="uploadImgUrl"
        list-type="picture-card"
        :on-success="handleUploadSuccess"
        :before-upload="handleBeforeUpload"
        :limit="limit"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        ref="imageUpload"
        :before-remove="handleDelete"
        :show-file-list="true"
        :headers="headers"
        :file-list="fileList"
        :on-preview="handlePictureCardPreview"
        :class="{ hide: fileList.length >= limit }"
        :data="{bizTypeEnum:bizType}"
    >
      <el-icon class="avatar-uploader-icon">
        <plus/>
      </el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
        v-model="dialogVisible"
        title="预览"
        width="80%"
        append-to-body
    >
      <img
          v-if="dialogFileType === 'image'"
          alt=""
          :src="dialogImageUrl"
          style="display: block; max-width: 100%; margin: 0 auto"
      />
      <video
          v-if="dialogFileType === 'video'"
          :src="dialogImageUrl"
          style="display: block; max-width: 100%; margin: 0 auto"
          muted
          controls
          autoplay
      ></video>
      <canvas
          style="max-width: 100%"
          v-if="dialogFileType === 'ts'"
          ref="tsVideoRef">
      </canvas>
    </el-dialog>
  </div>
</template>

<script setup>
import {getToken} from "@/utils/auth";
import {computed, getCurrentInstance, ref, watch} from "vue";
import {isTsVideo, getVideoFirstFrame, isVideo, getTsVideoFirstFrame} from '@/utils/file.js';

const props = defineProps({
  modelValue: [Array],
  // bizType 文件业务类型
  bizType: {
    type: String,
    required: true
  },
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 30,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg", "svg", "gif", "webp"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
});

const {proxy} = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
let dialogFileType = ref('image');
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
// const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/common/upload"); // 上传的图片服务器地址
const uploadImgUrl = import.meta.env.VITE_APP_BASE_API + "/business/file/upload"; // 上传文件服务器地址
const headers = ref({Authorization: "Bearer " + getToken()});
const fileList = ref([]);
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
  if (val) {
    val.forEach(async item => {
      item.url = await getFileUrl(item);
    });
    fileList.value = Array.isArray(val) ? val : props.modelValue.split(',');
  } else {
    fileList.value = [];
    return [];
  }
}, {deep: false, immediate: true});

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
      //后缀名判断
      if (props.fileType.includes(fileExtension)) {
        isImg = true;
        console.log(1);
      }
    }
    if (!isImg) {
      isImg = props.fileType.some(type => {
        return file.type.indexOf(type) > -1;
      });
    }
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(
        `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 401) {
    ElMessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
      confirmButtonText: '重新登录',
      cancelButtonText: '取消',
      type: 'warning'
    }).then(() => {
      isRelogin.show = false;
      useUserStore().logOut().then(() => {
        location.href = '/index';
      })
    }).catch(() => {
      isRelogin.show = false;
    });
    return;
  }
  if (res.code === 200) {
    uploadList.value.push({
      fileName: res.data.originFileName,
      filePath: res.data.filePath,
      fileId: res.data.fileId,
      name: res.data.originFileName,
      url: import.meta.env.VITE_APP_BASE_API + res.data.filePath
    });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  const findex = fileList.value.map(f => f.name).indexOf(file.name);
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1);
    // emit("update:modelValue", listToString(fileList.value));
    emit("update:modelValue", fileList.value);
    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.filePath !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    // emit("update:modelValue", listToString(fileList.value));
    emit("update:modelValue", fileList.value);
    proxy.$modal.closeLoading();
  }
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

/**
 * 获取文件url
 */
async function getFileUrl(file) {
  let fileName = file.originFileName || file.fileName;
  let url = import.meta.env.VITE_APP_BASE_API + file.filePath;
  if (isVideo(fileName)) {
    url = await getVideoFirstFrame(import.meta.env.VITE_APP_BASE_API + file.filePath);
  } else if (isTsVideo(fileName)) {
    url = await getTsVideoFirstFrame(import.meta.env.VITE_APP_BASE_API + file.filePath);
  }
  return url;
}

let tsVideoRef = ref(null);

// 预览
let player;

function handlePictureCardPreview(file) {
  if (isVideo(file.originFileName || file.fileName)) {
    dialogFileType.value = 'video';
  } else if (isTsVideo(file.originFileName || file.fileName)) {
    dialogFileType.value = 'ts';
    dialogVisible.value = true;
    nextTick(() => {
      if (tsVideoRef.value) {
        player = new JSMpeg.Player(import.meta.env.VITE_APP_BASE_API + file.filePath, {
          canvas: tsVideoRef.value,
          decodeFirstFrame: true,
          loop: true,
          progressive: true,
          audio: false,
          autoplay: true,
          onSourceCompleted() {
          }
        });
      }
    })
    return;
  } else {
    dialogFileType.value = 'image';
  }
  dialogImageUrl.value = import.meta.env.VITE_APP_BASE_API + file.filePath;
  dialogVisible.value = true;
}

watch(dialogVisible, newVal => {
  if (!newVal && player && player.destroy) {
    console.log("run");
    player.destroy();
  }
});

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(baseUrl, "") + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>
